Frequent Asked Questions | D-D The Aquarium Solution

Purchased 13 months ago complete with resin pod .noticed my marine tank NO3 
reading had increased over past 2 / 3 months to 10ppm from 0.25 no changes in 
my routines . After careful checking took readings from my unit and was 
surprised to 5ppm NO3. And the 80ltr tank of RO 10ppm.use this amount weekly
TDS reading into unit around 270 and after 6/7 ppm.
Decided to replace all cartridges including membrane and resin ,have produced 
a little over 25ltr and the TDS reading is now 3ppm. When 0 after 2ltr
Had replaces pre and carbon after 6 months.
Before the tap water reaches unit it has already passed through my Purity on 
Tap Hilux pre filter and chlornomore cartridges.

Hi Tony ,
                Can you help , I bought a deltec 1456 at xmas just gone 2016 , three weeks ago the pump never restarted after a routine water change now 4 months old . The shop was helpful and replaced free of with a new ddc2 pump but annoying said they'd had every pump back and that's why the 1455 was brought out , this is disgusting from both the shop and deltec to have continuing selling them models knowing the chances are they will break down ! It doesn't end there , for the last three weeks I've tried to sort the skimmer but it seems way too powerful and after about 45secs on the lower setting just foams over continuous , all the messing about has caused the tank to stress and I've lost two fish and have £350 of foam maker . Can you advise I've tried highering the skimmer and turned Venturi to both extremes . Should we have been a different air intake perhaps.



I am having problem with my new reactor. At first I had the issue with the pump being too powerful for the phosphate remover so I followed the instructions to T off the water to make it less powerful. This works although it quickly gets an airlock and stop and just pumps out the second outlet of the T. The pump is fully submerged in the sump and I am completely stumped as to how the air is getting in to cause this.

Do you know any solutions to this issue.

Many thanks


I recently purchased 3 x Hydra 26HDs from XXXXXXXX, 
. 2 were off the shelf and a 3rd was ordered for me. However it would 
appear that they are slightly different. The 3rd light has deeper Royal Blue 
LEDs - a couple of shades darker. Also I have noticed that when speed playing 
through the schedule the 3rd light does not join in and remains all LEDs off. 
The schedule appears to work fine on all 3 but occasionally I do get a red 
exclamation mark against the 3rd light which does come and go. I don't have 
them connected to my home WiFi the signal is not strong enough - I have them 
connected together using the AIFi - Is there anything I can do this and about 
the Royal Blue LEDs on the other 2 lights ? Thanks and Regards


I have an old deltec 1355 protein skimmer that has recently started humming really loudly.

Can you advise why this might be and what I can do to fix it?

Kind regards

I recently purchased al hydra 52 hd lights for my tank. I have it programmed for 8 hours of light during the day. Once the lights go off one blinks green and the other one is a steady blue. How do I get rid of this problem before I put my fish in the tank?

Thank You,


Hi guys trying to set up the Luna cycle and moonlighting on my 
new toy

Good morning,
I purchased last February 2 Hydra 52 HD lights from my local fish shop in 
Glasgow for my 7ft reef tank. I knew 2 lights would not be enough but due to 
unforeseen circumstances I could not get a third right away. Anyway I then 
bought a further light in the summer last year but I have only just set the 
third light up and there is a remarkable different in the blue led colour. 
The older 2 lights are more Iight blue and the new one is a deeper almost 
violet colour. When all three lights are on together the difference to my 
eyes is noticeable across the entire tank. Would you happen to know if the 
LED bulbs were changed in manufacture during this period?
Just makes the tank look a little odd later in the day when the blues become 
more in play.
Any help with this would be greatly appreciated.
Many thanks

Hi, I've been cycling a new tank and recorded a result of 1 on the salivert 
phosphate test kit. I added some rowa phos and this has come down to 0.5. 
This has been over a few weeks.

Do you think that this is now exhausted and i need to add a new 100ml? Can i 
just put the entire tub in?

I have a 95litre tank. All other readings are normal ammonia and nitrite are 
0, nitrate is 5. PH 8.2, alkalinity 8, salinity 1.025.

Many thanks for your help

Please can you tell me what is the macimum thickness of glass the protein skimmer 
will fit. I have a Juwel Rio 400 tank. It has a slight rim. Will this protein skimmer 
fit on it.
Many thanks


I have 3 Hydra 26 lights & have recently had to switch them off as I had to do a 3 day blackout as I am battling Dinoflagellates. I have now switched them back on & I have some problems: On the AI Quick Start Guide the label states Wi-Fi Network is on 6CF6(this is my middle light) & was the parent(green) - the outside 2 being the children. Since switching them back on my left light(6CFC) is the parent(although the light blinks green all the time) & my centre light(6CF6) & right light(6CFE) are the children(solid blue). When I go onto the AI app on my Android it says "Stand Alone" whereas before I'm sure it was "Cloud". I have set the lights for my normal schedule but with only Blue on & at 3% - they ramped down at 7PM(as per schedule) & went off at 8PM(as per schedule). 6CFC was still blinking green this morning. I have tried resetting the network settings/factory defaults as per "Button Functions" in the Quick Start Guide. Also can you advise of the fans at the top are on all the time(as they weren't when I reconnected my lights) or do they only come on when the unit gets hot(with only 3% Blue on for 90mins last night maybe the units didn't get hot enough?) These were purchased from my LFS circa Nov 2015.
Any help advice greatly appreciated. :)



Hello Tony,

I have seen a lot of helpful posts on the ultimate reef forum which I seem to be spending a bit too much time on!

I have bought a good few DD items through my LFS and this week a dd750 chiller for my rs reefer350 - believe it or not even now temp of the tank is creeping up because we have a lot of glass at the back of our house so i know I need a chiller.

I have bought a return pump and assume i need nothing else but some eheim green tube but have you any experience of where I'm best placing things - I'm using the standard sump that came with the tank so I have 2 or 3 chambers I could take water from and return water to - what's your recommendation as it doesn't appear to say in the instructions one place is better than another?

Chiller will be located in the right hand side of the cabinet as I am not able to situate elsewhere or nest to the tank so it's a very short run from sump to chiller and back.

I'm new to marine and am 2 months in so am going to put a thread up.

Thank you


Hi Stuart
Currently spending some time on the DD 900 and am wondering if the weir Combe is sitting right in the holder as seems lower that the housing. Should the Combe be higher to run at the same level as the housing or simply pushed down as shown?


How to remove the quartz sleeve and clean it? I cant seem to figure it out,.


Dear Sir/Mdm,

How are you?  I have been using the above for 3 years.  Recently i discovered that the waste collected in the cup is not more than 1/2 inch or so and will remain at this level for weeks even though is heavily stock with fishes.

Washed the cup and same result, 1/2 inch of waste collected.  So i thought is time to strip and waste the entire skimmer and it is still the same, no matter how i adjust the water adjustment.  It used to run beautifully for the past years and i have to empty the cup at least once a week.

Skimmer sits in the sump at about 22cm and air valve is set to max for the past 3 years. 

Hope u can advice the issue here?  Thanks!